多くの変更があるので、上記ブログを確認頂いた方が良さそうです。一部抜粋：Security:
caching_sha2_password default authentication mechanism
Dynamic Linking of OpenSSL in MySQL Server(yaSSL->OpenSSL)JSON Functions:
JSON Table FunctionsRLIKE/REGEXP:
ICU library to handle RLIKE/REGEXPSQL DIGEST:
STATEMENT_DIGEST() and STATEMENT_DIGEST_TEXT()Tablespaces:
ibd and system tablespace files can be moved from one location to another while the server is offline.

WORKLOG抜粋：
It’s used to extract data from a JSON document and form a relational table, that could be processed further using SQL. It’s a virtual table,
in this sense it’s like a derived table, with only difference in how result data is obtained. Just like a derived table, it’s specified in the FROM
clause, uses tmp table to store its result, and is able to provide generated indexes for ref access.

JSON_STORAGE_FREE(json_val)
For a JSON column value, this function shows how much storage space was freed in its binary representation after it was updated in place using JSON_SET() or JSON_REPLACE(). The argument can also be a valid JSON document or a string which can be parsed as one—either as a literal value or as the value of a user variable—in which case the function returns 0.

※Updating the column without using JSON_SET() (or JSON_REPLACE()) means that the optimizer cannot perform the update in place; in this case, JSON_STORAGE_FREE() returns 0.

JSON_STORAGE_SIZE(json_val)
This function returns the number of bytes used to store the binary representation of a JSON document.